emergency funds should not be invested. because we know that this emergency situation can happen anytime. we can not predict about this. if an emergency fund is invested in cryptocurrency and you need funds but the market price goes down, will you sell it directly..

When you make a plan make sure you have a backup plan also so that when the risk occurs such as a decrease in price or loss. you still have a backup plan you can use it. a backup plan can contain a backup of funds so your finances will remain stable and awake even if you suffer losses though
It's good to make savings as a habit for emergency needs, to buy things, for future use, and it can help your money to grow if you put it in a good project. I think we need to have a saving goals first and if we have enough savings we can start a small business or invest in stocks and bonds. In cryptocurrency, we can use to buy coins, hold, and sell it. But we have to be strategic because it needs enough knowledge, skills, and courage to take the risks. Formulate a goal and follow it creatively.